Network interfaces, configuring
From Ubuntuwiki.net
Ubuntu keeps its network configuration information in the file /etc/network/interfaces.
Sample:
# loopback auto lo iface lo inet loopback # primary network interface - static auto eth0 iface eth0 inet static address 192.168.0.2 netmask 255.255.255.0 gateway 192.168.0.1 # secondary network interface - dynamic auto eth1 iface eth1 inet dhcp